Java 9 Reactive Streams

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JDK 1.9 :  Reactive Streams

The Reactive Streams initiative provides a standard for asynchronous stream processing with nonblocking back pressure. A reactive stream provides a way to signal its source to ease production of data when the stream's destination becomes overwhelmed with that data. This signaling capability is like a valve on a water pipe. Closing this valve increases back pressure (the pressure back at the source) while easing the burden on the destination.

The initiative's objective is to govern the exchange of stream data across an asynchronous boundary (such as passing data to another thread) while ensuring that the destination isn't forced to buffer arbitrary amounts of data. In other words, back pressure is an integral part of this model in order to allow the queues that mediate between threads to be bounded. Note that the communication of back pressure is handled asynchronously.

Reactive Streams focuses on finding a minimal set of interfaces, methods, and protocols for describing the operations and entities needed to achieve the objective: asynchronous streams of data with nonblocking back pressure.

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